[Radiance-general] how to filter objects by modifier?

[Ian Tester]

Here's my contribution to the Radiance community. It looked like you guys 
needed the help of a good Perl programmer :)

It's not heavily tested, I only threw it together in a few hours. I've put 
in little comments to help anyone trying to follow the code. I know that 
Perl has a bad reputation, but I try to make my perl code neat and consistent.
*sigh* back in the day I was actually paid to code perl...

I added the feature of "following" modifiers with the -s option. When this 
option is specified, non-surface primitives (i.e materials, textures, 
patterns, or mixtures) will be matched by their modifier and their id will 
be added to the list of modifiers that are being matched. Make sense? This 
will allow the user to specify the name of one modifier that is then 
"modified" by other materials, etc.

Anyway, let me know how it goes. I've probably screwed up somewhere.
bye
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